Use depth comparison from pipeline to get correct fragment post-mods
Use depth comparison from pipeline to get correct fragment post-mods

* The fragments now correctly pass/fail depth so you won't see inconsistent
  post-modification values. Precision will make this slightly incorrect
  potentially, as we use D32 instead of the native depth size (as we can't
  - D16 has no stencil version).
* Likewise this won't account for stencil failures per-fragment.

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